User equipment and resource selection method for back-to-back transmissions in sidelink communication, and chip

Abstract

A resource selection method for back-to-back transmissions in sidelink communication (SL) by a user equipment (UE) includes triggering, by a higher layer of the UE, a first layer of the UE to perform a resource selection procedure based on one or more of parameters provided by the higher layer to report a remaining set of candidate resources, wherein the remaining set of candidate resources includes at least one set of resources in contiguous time slots.

What is claimed is: 
     
         1 . A resource selection method for back-to-back transmissions in sidelink communication (SL) by a user equipment (UE), comprising:
 triggering, by a higher layer of the UE, a first layer of the UE to perform a resource selection procedure based on one or more of parameters provided by the higher layer to report a remaining set of candidate resources, wherein the remaining set of candidate resources comprises at least one set of resources in contiguous time slots.   
     
     
         2 . The method of  claim 1 , wherein the one or more of parameters provided by the higher layer comprises at least one of:
 a channel access priority class (CAPC) level;   a time length of multi-consecutive slots transmission (MCSt) or number of contiguous time slots;   MCSt selection enabled/disabled;   SL-hybrid automatic repeat request (HARQ) feedback enabled/disabled;   a L1 priority of a physical sidelink shared channel (PSSCH) and its associated PSCCH transmission;   a number of SL resource sub-channels; or   a packet delay budget (PDB) or a remaining PDB.   
     
     
         3 . The method of  claim 1 , wherein reporting, by the first layer to the higher layer, the remaining set of candidate resources comprises performing, by the first layer, SL sensing, initializing, by the first layer, a candidate resource set, and excluding, by the first layer, resources from the candidate resource set based on the one or more of parameters provided by the higher layer. 
     
     
         4 . The method of  claim 1 , wherein the resource selection procedure performed by the first layer comprises a first stage of a resource exclusion process, wherein the first stage of the resource exclusion process comprises excluding, by the first layer, resources at a per-slot level basis from the remaining set of candidate resources according to one or more of the following conditions:
 UE's own SL PSSCH/physical sidelink control channel (PSCCH) and/or uplink (UL) transmissions;   sidelink synchronization signal block (S-SSB) transmission and/or reception occasions/slots;   slots configured with PSFCH resources; or   time for performing a type 1 channel access procedure.   
     
     
         5 . The method of  claim 4 , wherein the resource selection procedure performed by the first layer further comprises a second stage of the resource exclusion process, wherein the second stage of the resource exclusion process comprises excluding, by the first layer, resources at a per-resource level basis from the remaining set of candidate resources based on resource reservation information and a priority received in an sidelink control information (SCI), and a measured reference signal received power (RSRP). 
     
     
         6 . The method of  claim 5 , wherein in the second stage of the resource exclusion process, if a number of set of contiguous candidate resources remained after the per-resource level basis resource exclusion process does not satisfy one or more of the following criteria, a RSRP threshold level is increased and the first stage and the second stage of the resource exclusion process are repeated. 
     
     
         7 . The method of  claim 6 , wherein the RSRP threshold level is increased until one or more of the following criteria is satisfied:
 wherein there is at least one set of contiguous candidate resources remaining in the remaining set of candidate resources;   wherein there are at least Y sets of contiguous candidate resources remaining in the remaining set of candidate resources; or   wherein a number of sets of contiguous candidate resources remaining in the remaining set of candidate resources is at least X % of a total number of sets of contiguous candidate resources.   
     
     
         8 . The method of  claim 7 , wherein a value of Y and/or a value of X % are pre-configured, pre-defined, and/or provided by the higher layer. 
     
     
         9 . The method of  claim 1 , further comprising selecting, by the higher layer, MCSt resources from the remaining set of candidate resources for PSSCH/PSCCH transmissions. 
     
     
         10 . The method of  claim 9 , wherein when there are more than one set of contiguous candidate resources reported to the higher layer, the higher layer performs selection among the sets of contiguous candidate resources according one or more of the following criteria:
 not overlap with slots of own SL and/or UL transmissions;   not overlap with an additional/extra time required to complete the type 1 channel access procedure;   prioritizing earlier in time or an earliest set of resources that are in contiguous time slots;   prioritizing selection of set of contiguous time slot resources that are right before or after a resource reserved by another UE; or   a required time gap between multiple/adjacent transmissions of MCSt when a SL-HARQ feedback is enabled or a SL-HARQ feedback is associated with a logical channel of a medium access control packet data unit (MAC PDU)/transport block (TB).   
     
     
         11 . A user equipment (UE), comprising:
 a memory;   a transceiver; and   a processor coupled to the memory and the transceiver;   wherein the UE is configured to perform:
 triggering, by a higher layer of the UE, a first layer of the UE to perform a resource selection procedure based on one or more of parameters provided by the higher layer to report a remaining set of candidate resources, wherein the remaining set of candidate resources comprises at least one set of resources in contiguous time slots. 
   
     
     
         12 . The UE of  claim 11 , wherein the one or more of parameters provided by the higher layer comprises at least one of:
 a channel access priority class (CAPC) level;   a time length of multi-consecutive slots transmission (MCSt) or number of contiguous time slots;   MCSt selection enabled/disabled;   SL-hybrid automatic repeat request (HARQ) feedback enabled/disabled;   a L1 priority of a physical sidelink shared channel (PSSCH) and its associated PSCCH transmission;   a number of SL resource sub-channels; or   a packet delay budget (PDB) or a remaining PDB.   
     
     
         13 . The UE of  claim 11 , wherein the UE is configured to perform:
 performing, by the first layer, SL sensing, initializing, by the first layer, a candidate resource set, and excluding, by the first layer, resources from the candidate resource set based on the one or more of parameters provided by the higher layer.   
     
     
         14 . The UE of  claim 11 , wherein the resource selection procedure performed by the first layer comprises a first stage of a resource exclusion process, wherein the first stage of the resource exclusion process comprises excluding, by the first layer, resources at a per-slot level basis from the remaining set of candidate resources according to one or more of the following conditions:
 UE's own SL PSSCH/physical sidelink control channel (PSCCH) and/or uplink (UL) transmissions;   sidelink synchronization signal block (S-SSB) transmission and/or reception occasions/slots;   slots configured with PSFCH resources; and/or   time for performing a type 1 channel access procedure.   
     
     
         15 . The UE of  claim 14 , wherein the resource selection procedure performed by the first layer further comprises a second stage of the resource exclusion process, wherein the second stage of the resource exclusion process comprises excluding, by the first layer, resources at a per-resource level basis from the remaining set of candidate resources based on resource reservation information and a priority received in an sidelink control information (SCI), and a measured reference signal received power (RSRP). 
     
     
         16 . The UE of  claim 15 , wherein in the second stage of the resource exclusion process, if a number of set of contiguous candidate resources remained after the per-resource level basis resource exclusion process does not satisfy one or more of the following criteria, a RSRP threshold level is increased and the first stage and the second stage of the resource exclusion process are repeated. 
     
     
         17 . The UE of  claim 16 , wherein the RSRP threshold level is increased until one or more of the following criteria is satisfied:
 wherein there is at least one set of contiguous candidate resources remaining in the remaining set of candidate resources;   wherein there are at least Y sets of contiguous candidate resources remaining in the remaining set of candidate resources; or   wherein a number of sets of contiguous candidate resources remaining in the remaining set of candidate resources is at least X % of a total number of sets of contiguous candidate resources.   
     
     
         18 . The UE of  claim 17 , wherein a value of Y and/or a value of X % are pre-configured, pre-defined, and/or provided by the higher layer. 
     
     
         19 . The UE of  claim 11 , wherein the UE is configured to further perform:
 selecting, by the higher layer, MCSt resources from the remaining set of candidate resources for PSSCH/PSCCH transmissions.   
     
     
         20 . A chip, comprising:
 a processor configured to execute a computer program stored in a memory, to cause a device in which the chip is installed to:
 trigger, by a higher layer of the device, a first layer of the device to perform a resource selection procedure based on one or more of parameters provided by the higher layer to report a remaining set of candidate resources, wherein the remaining set of candidate resources comprises at least one set of resources in contiguous time slots.